PDO, PHP: Trying to instantiate object to call function - blank page - php

Question

So I have two files involved in this problem. One of them is the Database class and the other one is the file that include_once the Database file and then goes on to instantiate an object of that class to call a function -- getDB();.
Thats's where it goes wrong.
Database class:
<?php
class Database {
private static $datasource='mysql:host=localhost; dbname=db_name';
private static $username='root';
private static $password='root';
private static $db;
private function __construct(){}
public static function getDB(){
if(!isset(self::$db)){
try{
self::$db=new PDO(self::$datasource,self::$username,self::$password);
}
catch(PDOExceptin $e) {
$error=$e->getMessage(); //variable $error can be used in the database_error.php file
//display database error file.
//include('database_error.php');
exit();
}
}
return self::$db;
}
function Database(){
return new Database;
}
}
?>
And in my main file, I'm doing this:
<?php
include('partials/header.php');
include_once('functions/pdo.php');
$database = new Database();
$getdb = $database->getDB();
//Anything below won't show because of the failed instantiation of Database object above.
//code..
?>
Obviously, I'm doing something wrong here. I'm running MAMP with php 5.3.
How can I use my Database correctly? The reason I have a function with the same name as the class is because I read that you could instantiate the object with the function instead, but I didn't get that to work either...

Answer 1

You have a few errors here (use ini_set("display_errors", 1); error_reporting(-1); to see all your error messages):
The exception class of PDO is named PDOException and not PDOExceptin.
You call a static function from an non-static context: $database->getDb() where getDb is a static method. (write Database::getDb())
You write new Database which will result in a fatal error as the constructor is private (and named constructors have lower precedence than the magic method). Use there:
$getdb = Database::Database(); // and declare your Database method as static

Answer 2

PDOExceptin should be PDOException.
Also, it helps to turn display_errors on and to install xdebug when developing.

Answer 3

Obviously, I'm doing something wrong here.
Yes. you're writing way too much code.
The more code you write, the more errors you have. So, just get rid of all the useless code:
class Database {
private static $datasource='mysql:host=localhost; dbname=db_name';
private static $username='root';
private static $password='root';
private static $db;
public static function getDB(){
if(!isset(self::$db)){
self::$db=new PDO(self::$datasource,self::$username,self::$password);
}
return self::$db;
}
}
and call it this way
$db = Database::getDB();